#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2023, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

# ------------------------------------------------------------------------------
#  Set up Environment and transfer arguments
# ------------------------------------------------------------------------------
#
#  libfs.sh & scripts_common.sh: includes tools and lib calls
# ------------------------------------------------------------------------------

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
source ${DRIVER_PATH}/../libfs.sh

# -------- Get stat and datastore arguments from OpenNebula core ------------

DRV_ACTION=`cat -`
ID=$1

XPATH="${DRIVER_PATH}/../xpath.rb -b $DRV_ACTION"

unset i XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH /DS_DRIVER_ACTION_DATA/IMAGE/PATH \
                /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/NO_DECOMPRESS \
                /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/LIMIT_TRANSFER_BW)

unset i

SRC="${XPATH_ELEMENTS[i++]}"
NO_DECOMPRESS="${XPATH_ELEMENTS[i++]}"
LIMIT_TRANSFER_BW="${XPATH_ELEMENTS[i++]}"

# ------------------------------------------------------------------------------
#  Compute the size
# ------------------------------------------------------------------------------

SIZE=`fs_size "${SRC}" "${NO_DECOMPRESS}" "${LIMIT_TRANSFER_BW}"`

if [ $? -ne 0 ]; then
    if [ "${SIZE:-0}" = '0' ]; then
        error_message "Cannot determine size for ${SRC}"
    else
        error_message "${SIZE}"
    fi

    exit -1
fi

echo "${SIZE}"
